Hi Sierra,
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Sorry cant help with a inxpensive recommendation but you may want to check you VFD manual.? My TECO manual actually recommends NOT adding any capacitive, LC or RC components on the load side.? It does, obviously, recommend a reactor filter for the Line side for improving power quality - PFC and harmonics etc - and line thermal relays.
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That said, I do understand the reasoning for some DV/Dt sine filtering on the load side for longer cable lenghts to prevent voltage spikes and, I guess more importantly for you, help prevent "laminar squeal" and deteriation of the winding insulation on older motors.? If the latter is the case then the best option, really, is to replace the motor with a inverter duty type, but that could come at a higher cost than a sine filter.
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Anyway good luck.
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Ross
Morepork